The USDA Food Safety and Inspection Service says the foods were distributed to retailers and food services nationwide. They include several kinds of chicken and ham salads sold under the Market Pantry, Archer Farms, D'Amico and Sons, Finest Traditions, Garden Fresh and Weis brands.

The agency says problem was discovered through testing by the Food and Drug Administration.

There have been no reports of illnesses due to consumption of these products. The company and the agency advised anyone concerned about an illness to contact a health care provider.

Listeria can lead to miscarriages in pregnant women and serious illnesses in people with weakened immune systems.